/*
 * Copyright 2021 Shulie Technology, Co.Ltd
 * Email: shulie@shulie.io
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.shulie.surge.data.runtime.disruptor.dsl;

import io.shulie.surge.data.runtime.disruptor.BatchEventProcessor;
import io.shulie.surge.data.runtime.disruptor.EventHandler;
import io.shulie.surge.data.runtime.disruptor.ExceptionHandler;

/**
 * A support class used as part of setting an exception handler for a specific event handler.
 * For example:
 * <pre><code>disruptorWizard.handleExceptionsIn(eventHandler).with(exceptionHandler);</code></pre>
 *
 * @param <T> the type of event being handled.
 */
public class ExceptionHandlerSetting<T>
{
	private final EventHandler<T> eventHandler;
	private final ConsumerRepository<T> consumerRepository;

	ExceptionHandlerSetting(final EventHandler<T> eventHandler,
			final ConsumerRepository<T> consumerRepository)
	{
		this.eventHandler = eventHandler;
		this.consumerRepository = consumerRepository;
	}

	/**
	 * Specify the {@link ExceptionHandler} to use with the event handler.
	 *
	 * @param exceptionHandler the exception handler to use.
	 */
	public void with(ExceptionHandler exceptionHandler)
	{
		((BatchEventProcessor<?>) consumerRepository.getEventProcessorFor(eventHandler))
				.setExceptionHandler(exceptionHandler);
		consumerRepository.getBarrierFor(eventHandler).alert();
	}
}
